1 \section{Emptying a solid}
2 Several of the predefined solids have a ``\textit{hollow}'' relative which is naturally associated with it (the cone, the truncated cone, the cylinder, the prism and the spherical zone). For all those, the option \texttt{\Lkeyword{hollow}=true} is provided.
3 Set to \texttt{false}, we get the ``filled'' solid; set to \texttt{true} we get the ``hollow'' version.
6 \subsubsection{Example 1: a \Index{cylinder} and a \Index{hollow cylinder}}
10 \begin{LTXexample}[width=5cm]
12 \psset{lightsrc=viewpoint,viewpoint=50 60 25 rtp2xyz,Decran=50}
13 \begin{pspicture}(-2,-3)(6,6)
14 \psSolid[object=cylindre,h=6,r=2,
20 \begin{LTXexample}[width=5cm]
22 \psset{lightsrc=viewpoint,viewpoint=50 60 25 rtp2xyz,Decran=50}
23 \begin{pspicture}(-2,-3)(6,6)
24 \psSolid[object=cylindre,h=6,r=2,
25 fillcolor=yellow,incolor=red,
33 \subsubsection{Example 2: a \Index{prism} and a \Index{hollow prism}}
35 \begin{LTXexample}[width=8.7cm]
37 \psset{lightsrc=viewpoint,viewpoint=50 60 25 rtp2xyz,Decran=50}
38 \begin{pspicture}(-9,-4)(4,8)
39 \defFunction{F}(t){t cos 3 mul}{t sin 3 mul}{}
40 \defFunction{G}(t){t cos}{t sin}{}
41 \psSolid[object=grille,base=-6 6 -4 4,action=draw]%
42 \psSolid[object=prisme,
45 base=0 180 {F} CourbeR2+
46 180 0 {G} CourbeR2+](0,4,0)
47 \axesIIID(3,4,3)(8,6,7)
51 \begin{LTXexample}[width=8.7cm]
53 \psset{lightsrc=viewpoint,viewpoint=50 60 25 rtp2xyz,Decran=50}
54 \begin{pspicture}(-9,-4)(3,8)
55 \defFunction{F}(t){t cos 3 mul}{t sin 3 mul}{}
56 \defFunction{G}(t){t cos}{t sin}{}
57 \psSolid[object=grille,base=-6 6 -4 4,action=draw]%
58 \psSolid[object=prisme,
59 h=8,fillcolor=yellow,incolor=red,
60 RotX=90,hollow,ngrid=8 18,
61 base=0 180 {F} CourbeR2+
62 180 0 {G} CourbeR2+](0,4,0)
63 \axesIIID(3,4,3)(8,6,7)
68 \subsubsection{Example 3: a \Index{spherical zone} and a \Index{hollow spherical zone}}
70 \begin{LTXexample}[width=7.5cm]
72 \psset{lightsrc=10 20 30,viewpoint=50 60 25 rtp2xyz,Decran=50}
73 \begin{pspicture}(-7,-4)(5,7)
74 \psSolid[object=grille,
77 \psSolid[object=calottesphere,
81 theta=45,phi=-30](0,0,1.5)%
82 \axesIIID(3,3,3.6)(6,6,5)
86 \begin{LTXexample}[width=7.5cm]
88 \psset{lightsrc=10 20 30,viewpoint=50 60 25 rtp2xyz,Decran=50}
89 \begin{pspicture}(-7,-5)(7,5)
90 \psSolid[object=calottesphere,
97 \axesIIID(0,3,3)(6,5,4)